Pupils play in front of a classroom which uses solar energy for its heating devices in a village in Tibetan Autonomous Prefecture of Huangnan in northwest China's Qinghai Province, December 2, 2009. Solar energy has been widely used among local people in Qinghai. Local government also encouraged the residents to use the environment-friendly energy by providing them with solar cookers and solar panels. [Xinhua]

A teacher shows the dormitories which use solar energy for its heating devices at a primary school in a village in Tibetan Autonomous Prefecture of Huangnan in northwest China's Qinghai Province, December 2, 2009. [Xinhua]